Diastereoselective synthesis of the polyol-containing side chain of the ent-bengamides
作者:Ashley A. Jaworski、Jason D. Burch
DOI:10.1016/j.tetlet.2007.10.083
日期:2007.12
The synthesis of the non-natural antipode of the bengamide polyol-containing side chain has been achieved utilizing a diastereoselective oxygenated-enolate aldol reaction as the key step. A substrate-controlled reduction was used to complete the stereochemical array. (C) 2007 Elsevier Ltd. All rights reserved.
Boron aldol additions with erythrulose derivatives: dependence of stereoselectivity on the type of protecting group
作者:Miguel Carda、Eva Falomir、Juan Murga、Encarnación Castillo、Florenci González、J. Alberto Marco
DOI:10.1016/s0040-4039(99)01380-5
日期:1999.9
Boron aldol additions of 1-O-silylated 3,4-di-O-benzyl- and 3,4-di-O-benzoyl-l-erythrulose and achiral aldehydes using dicyclohexylboron chloride have been investigated. The dibenzyl derivative gave syn/syn stereoisomers with high stereoselectivity, whereas the dibenzoyl derivative gave syn/anti stereoisomers. It is believed that, while the dibenzoyl erythrulose gives rise to the E enolate in the presence
Influence of the protecting groups on the syn/anti stereoselectivity of boron aldol additions with erythrulose derivatives. A theoretical and experimental study
作者:Juan Murga、Eva Falomir、Florenci González、Miguel Carda、J.A Marco
DOI:10.1016/s0040-4020(02)01279-6
日期:2002.11
of protected l-erythrulose derivatives mediated by dicyclohexyl boron chloride. The syn/anti stereoselectivity has been found to depend on the type of protecting groups on the hydroxyl functions at C-3 and C-4. Thus, erythruloses benzylated at these hydroxyl groups gave only syn aldols while the corresponding benzoylatedderivatives gave anti aldols under the same reaction conditions. The resident chirality